Guts (lukespeedblitz) - Berserk
The Chosen Undead (Amendment50) - Dark Souls
Guts is pre-Berserker armor.
Chosen Undead is composite, as they appear at the end of the game.
Victory by death only.
Speed is equalized (to normal human speed).
Both are in-character. The fight is a random encounter.
Both have all available equipment.
Starting distance is 20 ft.